I have thought of this my whole life. Well, since I was 12 years old, so 48 years anyway. I would develop small reaction engines for orbital maneuvering. Make t

I have thought of this my whole life. Well, since I was 12 years old, so 48 years anyway. I would develop small reaction engines for orbital maneuvering. Make them lightweight and inexpensive and infinitely customizable. Sell them to every rocket company and satellite producer. Make a whole family from hypergolic to plasma to ion thrust. Be really good at it. Establish a 100% reliability record. But, how to bootstrap that? Perhaps write the software for some other reaction engine company? Or create a simulator for orbital maneuvering?